Rat-Grackle Share definition Flag Rat-Grackle is a nasty imaginary critter that lives inside a fat ho's vagina. The Rat Grackle's breath tends to be foul and fishy in smell. Man get the gas masks, Sally's Rat-Grackle has particularly bad breath today. Rat-Grackle by fly4adeadguy February 24, 2009 Get the Rat-Grackle mug.